EP1466645B1 - Connector set for medical use and indwelling catheter set using such connector set - Google Patents
Connector set for medical use and indwelling catheter set using such connector set Download PDFInfo
- Publication number
- EP1466645B1 EP1466645B1 EP04008646A EP04008646A EP1466645B1 EP 1466645 B1 EP1466645 B1 EP 1466645B1 EP 04008646 A EP04008646 A EP 04008646A EP 04008646 A EP04008646 A EP 04008646A EP 1466645 B1 EP1466645 B1 EP 1466645B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hub
- infusion
- needle
- plug
- catheter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001802 infusion Methods 0.000 claims abstract description 185
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 239000012858 resilient material Substances 0.000 claims abstract description 5
- 238000003780 insertion Methods 0.000 claims description 119
- 230000037431 insertion Effects 0.000 claims description 119
- 239000000463 material Substances 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- NOESYZHRGYRDHS-UHFFFAOYSA-N insulin Chemical compound N1C(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(NC(=O)CN)C(C)CC)CSSCC(C(NC(CO)C(=O)NC(CC(C)C)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CCC(N)=O)C(=O)NC(CC(C)C)C(=O)NC(CCC(O)=O)C(=O)NC(CC(N)=O)C(=O)NC(CC=2C=CC(O)=CC=2)C(=O)NC(CSSCC(NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2C=CC(O)=CC=2)NC(=O)C(CC(C)C)NC(=O)C(C)NC(=O)C(CCC(O)=O)NC(=O)C(C(C)C)NC(=O)C(CC(C)C)NC(=O)C(CC=2NC=NC=2)NC(=O)C(CO)NC(=O)CNC2=O)C(=O)NCC(=O)NC(CCC(O)=O)C(=O)NC(CCCNC(N)=N)C(=O)NCC(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC=CC=3)C(=O)NC(CC=3C=CC(O)=CC=3)C(=O)NC(C(C)O)C(=O)N3C(CCC3)C(=O)NC(CCCCN)C(=O)NC(C)C(O)=O)C(=O)NC(CC(N)=O)C(O)=O)=O)NC(=O)C(C(C)CC)NC(=O)C(CO)NC(=O)C(C(C)O)NC(=O)C1CSSCC2NC(=O)C(CC(C)C)NC(=O)C(NC(=O)C(CCC(N)=O)NC(=O)C(CC(N)=O)NC(=O)C(NC(=O)C(N)CC=1C=CC=CC=1)C(C)C)CC1=CN=CN1 NOESYZHRGYRDHS-UHFFFAOYSA-N 0.000 description 36
- 102000004877 Insulin Human genes 0.000 description 18
- 108090001061 Insulin Proteins 0.000 description 18
- 229940125396 insulin Drugs 0.000 description 18
- 239000008280 blood Substances 0.000 description 12
- 210000004369 blood Anatomy 0.000 description 12
- 210000000078 claw Anatomy 0.000 description 10
- 230000008961 swelling Effects 0.000 description 9
- 238000005520 cutting process Methods 0.000 description 7
- -1 polytetrafluoroethylene Polymers 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 4
- 230000000994 depressogenic effect Effects 0.000 description 4
- 238000000502 dialysis Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 238000002560 therapeutic procedure Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 3
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 229920012266 Poly(ether sulfone) PES Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229960000834 vinyl ether Drugs 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/10—Tube connectors; Tube couplings
- A61M39/1011—Locking means for securing connection; Additional tamper safeties
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/158—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body
- A61M2005/1587—Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body suitable for being connected to an infusion line after insertion into a patient
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
- A61M39/02—Access sites
- A61M39/06—Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof
- A61M39/0606—Haemostasis valves, i.e. gaskets sealing around a needle, catheter or the like, closing on removal thereof without means for adjusting the seal opening or pressure
Definitions
- the present invention relates to various connector sets for medical use provided, for example, on a solution infusion line, a blood transfusion line, a blood collection line, and an arterial and venous line for dialysis therapy, and to various indwelling catheter sets for performing solution infusion, blood transfusion, blood collection, and dialysis therapy, and so on (for example, a hypodermic injection set for a drug solution such as an insulin administration set).
- an administration set for administering insulin discontinuously or continuously having a female luer taper, and a needle and a male luer taper to be detachably connected to the female luer taper respectively (for example, see USP NO.6056718 ).
- the female luer taper includes:
- the needle includes:
- the male luer taper includes:
- a distal end of an infusion needle 81 is cut obliquely with respect to an axial center 82 thereof (bevel cut), and hence a distal opening edge 83 is beveled to provide a sharp cutting edge at its distal end, so that the infusion needle 81 itself has a puncturing capability with respect to the plug.
- the needle when indwelling the catheter under the skin of a patient, the needle is connected to the female luer taper, and the insertion needle of the needle and the catheter of the female luer taper are inserted under the skin of the patient and, subsequently, the insertion needle is pulled out from under the skin of the patient by detaching the needle from the female luer taper so that the catheter is left under the skin of the patient.
- the connecting port of the female luer taper is sealed by the plug, there is no risk of leakage of blood from the connecting port.
- the possibility that the infusion needle can follow the trace (puncture) formed on the plug by the insertion needle when it is inserted therein previously is extremely low, and in many cases, the distal end formed into a sharp cutting edge punctures into the plug afresh and is advanced therein while tearing the plug, and then the proximal portion thereof is followed into the plug in sequence.
- the portion of the plug 84 located on the distal side of the infusion needle 81 enters within the infusion needle 81, and is subjected to cutting operation by an inner peripheral edge 85 on the proximal side of the opening edge 83 at the distal end of the infusion needle 81.
- the plug is ground off, and such a phenomenon that a bore (puncture) is formed in the plug (coring) occurs. Consequently, the performance of the plug to seal the connecting port is deteriorated and, in addition, "ground chips" of the plug may enter into the infusion needle or the catheter, and eventually into the patient's body.
- the infusion needle since the distal end of the infusion needle is formed into a sharp cutting edge and hence itself has a puncturing capability with respect to the plug as described above, the infusion needle is inserted into the different points of the plug at every insertion into the plug, and hence tearing of the plug tends to take place. Therefore, when insertion of the infusion needle into the plug is repeated, the plug may lose its original strength or recovering property, and hence the performance of the plug to seal the connecting port may be deteriorated. Also, as described above, since the plug is repeatedly torn, fine chips of the plug tend to be generated, which may enter into the patient's body as in the above-described case.
- WO 02/07804 A which serves as basis for the preamble of claim 1, discloses an infusion set comprising a cannula housing, a needle housing adapted for connection to the cannula housing, and a needle, the cannula housing having a bore in which a self-sealing elastomeric septum is disposed.
- the needle which has a pointed end extends through a self-closing aperture in the septum.
- the needle delivers fluid from a fluid source to a cannula extending from and connected to the cannula housing.
- US 2001/0047154 A1 relates to a pre-slit injection site and tapered cannula and discloses two-part coupling members for fluid transfer including a pre-slit septum and a blunt cannula.
- the blunt cannula may be forced through the septum in order to establish a fluid communication path.
- An exterior surface of a distal end region of the cannula may be tapered, the end of the distal end region including an externally radiused tip.
- a connector set for medical use as defined by independent claim 1 and an indwelling catheter set using such connector set as defined by claim 7 are provided.
- the dependent claims define preferred and advantageous embodiments of the invention.
- the present invention relates to a connector set for medical use comprising:
- the connector set for medical use may further comprise:
- the connecter set for medical use may further comprise:
- the guide may comprise in the interior:
- the infusion needle and the infusion tubing hub may be integrally formed of plastic material, the opening edge of the distal end of the infusion needle being formed to be orthogonal to the axial center of the infusion needle and the inner peripheral side and the outer peripheral side of the opening edge being respectively formed into the outwardly projecting curved surface at the time of molding.
- the infusion needle may be coated with lubricant applied thereon.
- the present invention also relates to an indwelling catheter set comprising the above-described connector set, wherein a through bore is formed in the catheter hub of the cannula housing substantially in the axial direction, a proximal portion of the through bore being formed into the connecting port, a catheter being inserted into a distal portion of the through bore, the catheter being disposed substantially in the axial direction, and being formed into a hollow body opened at its distal and proximal ends, the catheter being communicated with the infusion needle when the infusion needle is inserted into the plug.
- the indwelling catheter set may comprise:
- the administration set includes a cannula housing 1, an insertion hub 2, and an infusion hub 3.
- the cannula housing 1 includes a catheter (soft cannula, outer needle, shielding needle, catheter tube) 5, catheter hub (indwelling needle base, outer needle base, shielding needle base) 6, a fixing device (a caulking pin for fixation) 7, a plug 8, a guide (a caulking pin for guiding) 9.
- the catheter 5 is disposed (substantially) in the axial direction, and formed into an elongated transparent (translucent) hollow (tubular) body having openings at its distal and proximal ends.
- the catheter 5 has flexibility and is formed integrally of plastic material (resin material).
- the plastic material includes, for example, thermoplastic resin.
- thermoplastic resin used here is, preferably, polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane (PU), tetrafluoroethylene-perfluoroalkyl-vinyl-ether copolymer (PFA), polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, polyoxymethylene, and more preferably, PTFE, ETFE, PP, and PU.
- PTFE polytetrafluoroethylene
- ETFE ethylene-tetrafluoroethylene copolymer
- PU polyurethane
- PFA tetrafluoroethylene-perfluoroalkyl-vinyl-ether copolymer
- PP polypropylene
- PE polyethylene
- PVC polyvinyl chloride
- the catheter hub 6 includes an upwardly projecting central protrusion (projection) 11 at the lateral center of the distal portion, upwardly projecting side protrusions (projections) 12 on the left and the right sides of the proximal portion, and a depression 13 depressed downward at the remaining portion.
- a through bore (insertion bore) 14 is formed so as to penetrate (substantially) in the axial direction.
- the through bore 14 includes a proximally tapered distal tapered bore 15, a straight bore 16 having a constant inner diameter in the direction of the axial center, a proximally tapered bore 17 tapered toward the distal end, and a connecting port 19 for feeding liquid having a larger diameter than the straight bore 16, all communicated with each other arranged in above-described sequence toward the proximal end.
- the proximal portion of the catheter 5 is inserted and fixed in the straight bore 16.
- the connecting port 19 may have a constant inner diameter in the direction of the axial center, or tapered toward the distal end at a small taper ratio depending on the cases.
- the inward side surfaces of the side protrusions 12 serve as guiding surfaces 20, and the axially central portions of the guiding surfaces 20 are beveled surfaces 21 extending inwardly as it proceeds to the distal end.
- the catheter hub 6 is integrally formed of plastic material (resin material), and the plastic material is preferably the same as those of the catheter 5, polyethersulfone (PES), or ABS resin, and more preferably, PP, PE, PES, PVC, and ABS resin.
- the fixing device 7 clamps and fixes the proximal portion of the catheter 5 in cooperation with the inner surface of the straight bore 16 of the through bore 14, and is a hollow body having openings on the axial ends thereof.
- the portion other than the proximal end portion is a straight portion having a small outer diameter constant in the direction of axial center, and the proximal end portion is flared so as to be enlarged toward the proximal end.
- Fixation of the catheter 5 with respect to the catheter hub 6 is achieved in the following manner.
- the heated fixing device 7 is press-fitted into the proximal portion of the catheter 5.
- the proximal portion of the catheter 5 is enlarged radially outwardly.
- the fixing device 7 is integrally formed, for example, of stainless steel (SUS304 is preferable), nickel-titan alloy, plastic material (resin material).
- the plug 8 is formed into substantially a columnar shape, and fitted and fixed into the connecting port 19 of the catheter hub 6 for sealing the connecting port 19.
- the present invention employs “press-fitting”, and hence the plug 8 is press-fitted into the connecting port 19.
- press-fitting means a state of "inserted in a state of being compressed in the axial and radial directions", and the reason to press-fit is for desirably sealing the connecting port 19 by bringing the outer surface of the plug 8 into press-contact (close contact) with the inner surface of the connecting port 19.
- the connecting port 19 is satisfactorily sealed by press-contact (close contact) of the plug 8 with the inner surface of the connecting port 19 by fitting (press-fitting and fixing) the guide 9 into a proximal bore 24 of the plug 8 and the connecting port 19 of the catheter hub 6.
- a distal bore 23 of truncated conical shape is punctuated from the center of the distal end surface of the plug 8 toward the proximal end, and the proximal bore (engaging bore) 24 is punctuated (formed) from the center of the proximal surface of the plug 8 toward the distal end.
- the proximal bore 24 includes a straight bore 25 formed on the distal side having a constant inner diameter in the direction of the axial center, and a tapered bore 26 is formed on the proximal side so as to be tapered toward the distal end.
- the plug 8 is formed of a resilient material, for example, rubber material such as isoprene rubber, silicon rubber, butyl rubber, thermoplastic elastomer, silicon elastomer, or latex.
- the guide 9 has both a function for retaining (fixing) the plug 8, and a function for guiding an insertion needle of an insertion hub 2 or an infusion needle of an infusion hub 3 described later, and is fitted (press-fitted and fixed) into the proximal bore 24 of the plug 8 and the connecting port 19 of the catheter hub 6.
- the guide 9 is formed into a hollow body having openings at its distal and proximal ends, and is integrally formed with a cylindrical portion 28 to be inserted (press-fitted) into the straight bore 25 of the proximal bore 24, the tapered bore 26 of the proximal bore 24, and a tapered portion 29 to be press-fitted into the proximal end of the connecting port 19.
- the guide 9 is fixed to the catheter hub 6 and hence the plug 8 is fixed to the catheter hub 6 by the proximal edge of the tapered portion 29 being press-fitted and fitted into the inner surface of the plug 8 while resiliently deforming the proximal end of the connecting port 19. Therefore, the plug 8 is prevented from falling off the connecting port 19.
- the interior of the cylindrical portion 28 is a straight bore 30 having a constant inner diameter in the direction of the axial center, and the interior of the tapered portion 29 is a distally tapered bore 31.
- the axial centers of the straight bore 30 and the tapered bore 31 (substantially) align with the axial center of the connecting port 19 of the cannula housing 1.
- the inner surface of the tapered bore 31 guides the insertion needle and the infusion needle to the (substantially) axial center of the plug 8 when they are inserted into the plug 8, which will be described below.
- the inner diameter of the distal end of the tapered bore 31, that is, the smallest inner diameter, and the inner diameter of the straight bore 30 are slightly larger than, but close to, the outer diameters of the insertion needle and the infusion needle as described later.
- the guide 9 is integrally formed of the same material as the fixing device 7.
- the insertion hub 2 is to be detachably connected to the cannula housing 1 from its proximal end and, as shown in Fig. 9, includes an insertion needle (inner needle) 33, and an insertion needle hub (inner needle base) 34.
- the insertion needle 33 is detachably inserted into the guide 9, the plug 8, the fixing device 7, and the catheter 5 of the cannula housing 1 and projects distally from the catheter 5.
- the insertion needle 33 is disposed (substantially) in the axial direction, and is formed into a flexible elongated hollow (tubular) body having openings at its distal and proximal ends.
- the distal end of the insertion needle 33 is cut obliquely with respect to the axial center thereof (bevel cut) and hence a distal opening edge 36 is beveled to provide a sharp cutting edge.
- the distal opening of the insertion needle 33 faces upward.
- the insertion needle 33 is integrally formed, for example, of stainless steel (SUS 304 is preferable), or nickel-titan alloy.
- the insertion needle hub 34 is provided at the proximal portion of the insertion needle 33, and is to be detachably connected to the catheter hub 6 of the cannula housing 1 from its proximal end, and includes integrally formed a main body 38 and a pair of left and right engaging claws 39.
- the insertion needle hub 34 is formed of the same material as the catheter hub 6.
- An insertion bore 41 for the insertion needle is formed at the lateral center of the main body 38 so as to penetrate (substantially) in the axial direction.
- the insertion bore 41 includes a proximally tapered bore 42, a straight bore 43 having a constant inner diameter in the direction of axial center, a depressed portion 44 having an inner diameter constant in the direction of the axial center and larger than the outer diameter of the straight bore 43, all communicated with each other arranged in above-described sequence toward the distal end.
- the insertion needle 33 is inserted from its distal end into the insertion bore 41, and fixed to the inner surface of the tapered bore 42 and the straight bore 43 with an adhesive agent 45, so as to project distally from the insertion needle hub 34 to a large extent.
- the insertion needle 33 can be inserted easily into the insertion bore 41.
- the insertion needle 33 is welded to the insertion needle hub 34.
- the engaging claws 39 each constitute a locking mechanism for the insertion hub 2 in cooperation with the side protrusions 12 of the catheter hub 6, and project distally from the left and the right sides of the distal portion of the main body 38 so as to be capable of swinging in the lateral direction by resilient deformation of their own.
- the outward side surfaces of the distal portions of the engaging claws 39 are beveled surfaces 47 inclining inwardly as they proceed toward the distal end, and the proximal sides of the beveled surfaces 47 on the above-described outward side surfaces are formed with depressions 48 which are depressed inwardly, and the distal inner surfaces of the depressions 48 serve as engaging portions 49 having proximally facing planar surfaces, respectively.
- the engaging claws 39 When connecting the insertion hub 2 into the cannula housing 1, the engaging claws 39, being guided by the guiding surface 20 of the catheter hub 6 and resiliently deformed inwardly, are inserted between the central protrusion 11 and the side protrusions 12 of the catheter hub 6.
- the bevel surfaces 47 When the bevel surfaces 47 are moved distally of the side protrusions 12 of the catheter hub 6, they swing outwardly by their resilient recovery force, and the engaging portions 49 move distally of the side protrusions 12, so that an accidental disconnection of the insertion hub 2 from the cannula housing 1 is prevented.
- Disconnection of the insertion hub 2 from the cannula housing 1 can easily be done by holding both engaging claws 39 and swinging inwardly, moving the engaging portions 49 inwardly of the side protrusions 12 and moving the insertion hub 2 proximally of the cannula housing 1.
- the infusion hub 3 which is to be detachably connected to the cannula housing 1 from its proximal end and, as shown in Fig. 13 and Fig. 14 as well, includes an infusion needle (solution infusion needle) 51 for feeding liquid, an infusion tubing hub (infusion needle base, solution infusion needle base) 52, a tube (liquid feeding line) 53, and a connector 54.
- infusion needle solution infusion needle
- infusion tubing hub infusion needle base, solution infusion needle base
- tube liquid feeding line
- the infusion needle 51 is to be connected to the liquid feeding line and detachably inserted into the guide 9 and the plug 8 of the cannula housing 1 so as to communicate with the catheter 5.
- the infusion needle 51 is disposed (substantially) in the axial direction and formed into a flexible elongated hollow (tubular) body having openings at its distal and proximal ends, and has (substantially) the same outer diameter as the insertion needle 33.
- a surface of an (entire) opening edge 56 of the distal end of the infusion needle 51 is orthogonal to an axial center 57 of the infusion needle 51.
- the opening edge 56 (The surface of the opening edge 56) of the infusion needle 51 is smoothly chamfered, and at least (the surface (outer surface) of) the outer peripheral side (periphery) and the inner peripheral side of the opening edge 56 is formed into an outwardly projecting (swelling) curved surface (curved projection) so as to make the opening edge 56 into a nonsharp state. Therefore, the infusion needle 51 has little or no puncturing capability.
- the surface (outer surface) of) the opening edge 56 has a flat surface (plane face) 58 having a distally facing planar surface at the radially center thereof, an inwardly projecting (swelling) curved surface (curved face, curved projection) 59 curvedly projecting (swelling) distally and radially inwardly at the inner peripheral side (periphery) thereof, and an outwardly projecting (swelling) curved surface (curved face, curved projection) 60 curvedly projecting (swelling) distally and radially outwardly at the outer peripheral side (periphery) thereof.
- the infusion needle 51 is integrally formed, for example, of stainless steel (SUS 304 is preferable).
- the infusion needle 51 is coated with lubricant such as silicone oil or the like applied thereon.
- An infusion tubing hub 52 being provided at the proximal portion of the infusion needle 51, is to be detachably connected to the catheter hub 6 of the cannula housing 1 from its proximal end, and includes a main body 61 and a pair of left and right engaging claws 62 integrally formed with each other, similar to the insertion needle hub 34.
- the infusion tubing hub 52 is formed of the same material as the catheter hub 6 or the insertion needle hub 34.
- An infusion needle insertion bore 64 is formed (substantially) in the axial direction so as to penetrate through the lateral center of the main body 61.
- the insertion bore 64 includes a proximally tapered bore 65, a straight bore 66 having a constant inner diameter in the direction of the axial center, a tube fitting bore 67 having an inner diameter constant in the direction of the axial center and larger than that of the straight bore 66, all communicated with each other arranged in the above-described sequence toward the proximal end.
- the infusion needle 51 is inserted into the insertion bore 64 from its distal end, and fixed to the inner surfaces of the tapered bore 65 and the straight bore 66 with an adhesive agent 68 so as to project distally from the main body 61.
- the infusion needle 51 can easily be inserted into the insertion bore 64.
- the infusion needle 51 is welded to the infusion tubing hub 52.
- the engaging claws 62 each constitute a locking mechanism for the insertion hub 3 in cooperation with the side protrusions 12 of the catheter hub 6, and project distally from the left and the right sides of the distal portion of the main body 61 so as to be capable of swinging in the lateral direction by resilient deformation of their own.
- the outward side surfaces of the distal portions of the engaging claws 62 are beveled surfaces 70 inclining inwardly as they proceed toward the distal end, and the proximal sides of the beveled surfaces 70 on the above-described outward side surface are formed with depressions 71 which are depressed inwardly, and the distal inner surfaces of the depressions 71 serve as engaging portions 72 having proximally facing planar surfaces, respectively.
- the engaging claws 62 When connecting the infusion hub 3 to the cannula housing 1, the engaging claws 62, being guided by the guiding surface 20 of the catheter hub 6 and resiliently deformed inwardly, are inserted between the central protrusion 11 and the side protrusions 12 of the catheter hub 6.
- the beveled surfaces 70 When the beveled surfaces 70 are moved distally of the side protrusions 12 of the catheter hub 6, they swing outwardly by their resilient recovery force, and the engaging portions 72 move distally of the side protrusions 12, so that an accidental disconnection of the infusion hub 3 from the cannula housing 1 is prevented.
- Disconnection of the infusion hub 3 from the cannula housing 1 can easily be done by holding both engaging claws 62 and swinging inwardly, moving the engaging portions 72 inwardly of the side protrusions 12 and moving the infusion hub 3 proximally of the cannula housing 1.
- the tube 53 is an example of the liquid feeding line, and is transparent (translucent).
- the distal end of the tube 53 is fitted on the proximal portion of the infusion needle 51, and is fixed to the inner surface of the tube fitting bore 67 of the insertion bore 64 of the infusion tubing hub 52, for example, with adhesion or welding.
- the length of the tube 53 may be freely determined as needed depending on the location of the insulin administration pump (not shown).
- the tube 53 is integrally formed of plastic material.
- the connector 54 is a hollow body having openings at its distal and proximal ends, and fitted onto the proximal end of the tube 53 in communication with each other, and is to be connected to an insulin administration pump directly or indirectly via a connecting line (member) such as a tube.
- a connecting line member
- the opening of the proximal end of the connector 54 is sealed by a sealing member 74 such as a filter or a lid member before connecting the connecting line to the connector 54.
- the connector 54 is integrally formed of the same material as the catheter hub 6.
- insertion of the catheter 5 under the skin of a patient is carried out by connecting the insertion hub 2 to the cannula housing 1, connecting the insertion needle hub 34 of the insertion hub 2 to the catheter hub 6 of the cannula housing 1 from its proximal end, and inserting the insertion needle 33 of the insertion hub 2 to the guide 9, the plug 8, the fixing device 7, and the catheter 5 of the cannula housing 1 from its proximal end as shown in Fig. 1 to Fig. 3, and when inserting the insertion needle 33 into the plug 8, the plug 8 is resiliently deformed.
- the axial centers of the straight bore 25 and the tapered bore 26 of the guide 9 are (substantially) aligned with the axial center of the connecting port 19 of the cannula housing 1, and the inner diameter of the distal end of the tapered bore 26, that is, the smallest inner diameter, and the inner diameter of the straight bore 25 are slightly larger than the outer diameter of the insertion needle 33. Therefore, when inserting the insertion needle 33 as described above, the sharp edged distal end of the insertion needle 33 is guided by the inner surface of the tapered bore 26 of the guide 9 while being centered, and is guided into the (substantially) axial center of the guide 9, that is, of the connecting port 19 so as to be inserted easily into the straight bore 25 of the guide 9.
- the insertion needle 33 can easily be inserted into the (substantially) axial center of the plug 8, and the insertion needle 33 is projected distally from the distal bore 23 of the plug 8, so as to be inserted into the catheter 5 of via the fixing device 7.
- the insertion hub 2 in a state in which the insertion hub 2 is connected to the cannula housing 1, the insertion needle 33 and the catheter 5 are inserted under the skin of the patient. Then, the insertion hub 2 is disconnected from the cannula housing 1 to pull out the insertion needle 33 from under the skin of the patient and from the cannula housing 1, and the catheter 5 is indwelled under the skin of the patient. In this case, the trace (puncture) formed by the insertion needle 33 on the plug 8 is sealed by resilient recovering force of the plug 8. Therefore, the risk of leakage of blood from the connecting port 19 of the cannula housing 1 or entrance of outside air from the connecting port 19 into the through bore 14 may be eliminated.
- discontinuous or continuous administration of insulin is carried out, as shown in Fig. 10 to Fig. 12, by connecting the infusion hub 3, to which the insulin administration pump is connected, to the cannula housing 1, connecting the infusion tubing hub 52 of the infusion hub 3 to the catheter hub 6 of the cannula housing 1 from its proximal end, and then inserting the infusion needle 51 of the infusion hub 3 to the guide 9 and the plug 8 of the cannula housing 1 from its proximal end so as to communicate with the catheter 5.
- the distal opening edge 56 has a flat surface 58 having a distally facing planar surface at the radially center thereof, an inwardly projecting (swelling) curved surface 59 curvedly projecting distally and radially inwardly at (the surface of) the inner peripheral side (periphery) thereof, and an outwardly projecting (swelling) curved surface 60 curvedly projecting (swelling) distally and radially outwardly at (the surface of) the outer peripheral side (periphery) thereof. Therefore, the infusion needle 51 itself has little or no puncturing capability.
- the infusion needle 51 is inserted into the trace 76 of the plug 8 so as to follow the trace 76 while resiliently deforming the plug 8 as shown in Fig. 16.
- the infusion needle 51 when the infusion needle 51 is inserted into the plug 8, the infusion needle 51 neither tears the plug 8 while advancing, nor cuts off the plug 8 by the inner peripheral side (periphery) of the opening edge 56 of the infusion needle 51 as in the related art, but the infusion needle 51 is inserted into the trace 76 of the insertion needle 33.
- the infusion needle 51 itself has little or no capability of puncturing the plug 8, and the infusion needle 51 is inserted into the trace 76 of the insertion needle 33. Therefore, the risk that the infusion needle 51 is inserted into the plug 8 at different positions at every insertion into the plug 8 and hence tears the plug 8 is extremely low. Therefore, even when insertion of the infusion needle 51 into the plug 8 is repeated, the risk that the plug 8 loses its original strength or the recovering performance is extremely low, and hence the risk that the sealing performance of the plug 8 with respect to the connecting port 19 is deteriorated is extremely low and the risk that the plug 8 is repeatedly torn is also extremely low as described above. Consequently, the risk of generating fine strips of the plug 8 is extremely low, and the risk that the fine strips of the plug 8 enter into the patient's body is also extremely low.
- the position of the plug 8 where the insertion needle 33 is to be inserted does not align with the (substantially) axial center of the plug 8, but is dispersed in a wide area including the axial center of the plug 8, and the infusion needle 51 can hardly follow the trace 76 of the insertion needle 33 in the plug 8.
- the guide 9 is provided on the cannula housing 1, the axial centers of the straight bore 30 and the tapered bore 31 of the guide 9 (substantially) align with the axial center of the connecting port 19 of the cannula housing 1, and the inner diameter at the distal end of the tapered bore 31, that is, the smallest inner diameter thereof, and the inner diameter of the straight bore 30 are slightly larger than the outer diameter of the insertion needle 33. Therefore, as described above, the insertion needle 33 is inserted into the (substantially) axial center of the plug 8.
- the infusion needle 51 When the infusion needle 51 is inserted into the plug 8 as well, the infusion needle 51 is guided by the inner surface of the tapered bore 31 of the guide 9 while being centered, and is guided into the (substantially) axial center of the guide 9, that is, of the connecting port 19 so as to be easily inserted into the straight bore 30 of the guide 9.
- the infusion needle 51 has (substantially) the same outer diameter as the insertion needle 33, and the outer diameter thereof is slightly smaller than the inner diameter of the straight bore 30. Therefore, the infusion needle 51 can easily be inserted into the trace 76 in the plug 8 smoothly by following (tracing) the trace 76 of the insertion needle 33, and insertion and pulling out of the infusion needle 51 into/from the trace 76 can easily be repeated.
- the infusion needle 51 since the infusion needle 51 itself has little or no puncturing capability, the risk that the user picks his/her finger or hand is extremely low. Therefore, it is not necessary to provide a protective wall for surrounding the infusion needle 51 as shown in USP No.6056718 , and hence the infusion hub 3 can be downsized. In addition, since the infusion needle 51 is coated with lubricant applied thereon, the infusion needle 51 can be inserted into the trace 76 in the plug 8 easily and smoothly.
- the insulin can be administered into the patient's body discontinuously or continuously via the connector 54, the tube 53, the infusion needle 51, the fixing device 7, and the catheter 5 of the infusion hub 3 from the pump.
- the infusion hub 3 is disconnected from the cannula housing 1 to disconnect the infusion tubing hub 52 of the infusion hub 3 from the catheter hub 6 of the cannula housing 1, and then the infusion needle 51 of the infusion hub 3 is pulled out from the plug 8 and the guide 9 of the cannula housing 1.
- the trace of the infusion needle 51 that is, the trace 76 of the insertion needle 33
- the plug 8 is closed by the resilient recovering force of the plug 8, and the risk of leakage of blood from the connecting port 19 of the cannula housing 1 or entrance of outside air from the connecting port 19 into the through bore 14 is eliminated.
- Fig. 17 and Fig. 18 show a second embodiment of the present invention, in which the guide 9 has a configuration as in the first embodiment but having the cylindrical portion 28 removed from the guide 9 and being tapered toward the distal end.
- Fig. 19 and Fig. 20 show a third embodiment of the present invention, and the infusion needle 51 and the infusion tubing hub 52 of the infusion hub 3 are integrally molded of plastic material.
- the opening edge 56 of the distal end of the infusion needle 51 is molded as in the same manner as the first embodiment.
- the step of adhering or welding the infusion needle 51 to the infusion hub 52 is also necessary as in the related art.
- the infusion needle 51 and the infusion tubing hub 52 are integrally molded, and at the time of molding, the opening edge 56 of the distal end of the infusion needle 51 is molded as in the first embodiment. Therefore, it is not necessary to carry out machining to the opening edge 56 of the distal end of the infusion needle 51, and hence the number of machining steps does not increase in comparison with the related art. In addition, the process of adhering or welding the infusion needle 51 to the infusion tubing hub 52, which has been necessary in the related art as well, is not necessary. Therefore, according to the third embodiment, the cost of manufacturing the infusion hub 3, that is, the insulin administration set may be reduced with respect to the related art.
- the present invention is applied to an insulin administration set.
- the present invention is applicable to (1) various indwelling catheter sets for solution infusion other than insulin, blood transfusion, blood collection, dialysis therapy, and so on, and (2) various connectors for medical use in which the cannula housing does not have a catheter, and is provided on a solution infusion line, a blood transfusion line, a blood collection line, and an arterial and venous line for dialysis therapy.
Abstract
Description
- The present invention relates to various connector sets for medical use provided, for example, on a solution infusion line, a blood transfusion line, a blood collection line, and an arterial and venous line for dialysis therapy, and to various indwelling catheter sets for performing solution infusion, blood transfusion, blood collection, and dialysis therapy, and so on (for example, a hypodermic injection set for a drug solution such as an insulin administration set).
- There is an administration set for administering insulin discontinuously or continuously having a female luer taper, and a needle and a male luer taper to be detachably connected to the female luer taper respectively (for example, see
USP NO.6056718 ). - In this set, the female luer taper includes:
- (a) a catheter disposed in the axial direction and formed into a hollow body having openings at its distal and proximal ends;
- (b) a catheter hub including an axially extending through bore having an opening at its distal end for fitting the catheter and an opening at its proximal end as a connecting port for feeding insulin; and
- (c) a plug formed of rubber material to be fitted to the connecting port for sealing the connecting port.
- The needle includes:
- (a) an insertion needle disposed in the axial direction, the insertion needle being detachably inserted into the plug and the catheter from proximal ends thereof when connecting the needle and the female luer taper; and
- (b) an insertion needle hub provided at a proximal end of the insertion needle, the insertion needle hub being detachably connected to the catheter hub from its proximal end when connecting the needle and the female luer taper.
- The male luer taper includes:
- (a) an infusion needle disposed in the axial direction and formed into a hollow body having openings at its distal and proximal end, the infusion needle being connected to the insulin administering line at its proximal end, the infusion needle being detachably inserted into the plug from its proximal end when connecting the male luer taper and the female luer taper, so as to communicate with the catheter; and
- (b) an infusion tubing hub provided at the proximal portion of the infusion needle, the infusion tubing hub being detachably connected to the catheter hub from its proximal end when connecting the male luer taper and the female luer taper.
- As shown in Fig. 21, a distal end of an
infusion needle 81 is cut obliquely with respect to anaxial center 82 thereof (bevel cut), and hence a distalopening edge 83 is beveled to provide a sharp cutting edge at its distal end, so that theinfusion needle 81 itself has a puncturing capability with respect to the plug. - In the configuration described above, when indwelling the catheter under the skin of a patient, the needle is connected to the female luer taper, and the insertion needle of the needle and the catheter of the female luer taper are inserted under the skin of the patient and, subsequently, the insertion needle is pulled out from under the skin of the patient by detaching the needle from the female luer taper so that the catheter is left under the skin of the patient. In this case, since the connecting port of the female luer taper is sealed by the plug, there is no risk of leakage of blood from the connecting port.
- Then, what has to be done when administering insulin discontinuously or continuously is to connect the male luer taper to the female luer taper, insert the infusion needle of the male luer taper into the plug of the female luer taper so as to communicate with the catheter, and administer insulin to the patient. When administration is completed, the male luer taper is disconnected from the female luer taper, and the infusion needle of the male luer taper is pulled out from the plug of the female luer taper. In this case as well, since the connecting port of the female luer taper is sealed by the plug, there is no risk of leakage of blood from the connecting port. Since administration of insulin is carried out as needed according to the conditions of the patient, the infusion needle of the male luer taper may be inserted into the plug of the female luer taper a plurality of times.
- In
USP No. 6056718 , as described above (see Fig. 21), the distal end of theinfusion needle 81 is cut obliquely with respect to theaxial center 82 thereof to provide a sharp cutting edge, so that theinfusion needle 81 itself has a puncturing capability with respect to the plug. - Therefore, when inserting the infusion needle to the plug, the possibility that the infusion needle can follow the trace (puncture) formed on the plug by the insertion needle when it is inserted therein previously is extremely low, and in many cases, the distal end formed into a sharp cutting edge punctures into the plug afresh and is advanced therein while tearing the plug, and then the proximal portion thereof is followed into the plug in sequence. Accordingly, as shown in Fig. 22, the portion of the
plug 84 located on the distal side of theinfusion needle 81 enters within theinfusion needle 81, and is subjected to cutting operation by an innerperipheral edge 85 on the proximal side of theopening edge 83 at the distal end of theinfusion needle 81. - Therefore, after repeated insertion of the infusion needle into the plug, the plug is ground off, and such a phenomenon that a bore (puncture) is formed in the plug (coring) occurs. Consequently, the performance of the plug to seal the connecting port is deteriorated and, in addition, "ground chips" of the plug may enter into the infusion needle or the catheter, and eventually into the patient's body.
- In addition, since the distal end of the infusion needle is formed into a sharp cutting edge and hence itself has a puncturing capability with respect to the plug as described above, the infusion needle is inserted into the different points of the plug at every insertion into the plug, and hence tearing of the plug tends to take place. Therefore, when insertion of the infusion needle into the plug is repeated, the plug may lose its original strength or recovering property, and hence the performance of the plug to seal the connecting port may be deteriorated. Also, as described above, since the plug is repeatedly torn, fine chips of the plug tend to be generated, which may enter into the patient's body as in the above-described case.
- Furthermore, when the distal end of the infusion needle is formed into a sharp cutting edge as described above, the user has a risk to prick his/her finger or hand accidentally by the infusion needle. In order to avoid such risk, it is necessary to provide a protective wall which surrounds the infusion needle as disclosed in
USP NO. 6056718 . However, in doing so, another problem that the male luer taper becomes bulky arises. -
WO 02/07804 A claim 1, discloses an infusion set comprising a cannula housing, a needle housing adapted for connection to the cannula housing, and a needle, the cannula housing having a bore in which a self-sealing elastomeric septum is disposed. In use, the needle which has a pointed end extends through a self-closing aperture in the septum. The needle delivers fluid from a fluid source to a cannula extending from and connected to the cannula housing. -
US 2001/0047154 A1 relates to a pre-slit injection site and tapered cannula and discloses two-part coupling members for fluid transfer including a pre-slit septum and a blunt cannula. The blunt cannula may be forced through the septum in order to establish a fluid communication path. An exterior surface of a distal end region of the cannula may be tapered, the end of the distal end region including an externally radiused tip. - As a result of earnest investigations made by the inventors to solve the problems associated with the conventional techniques, the present invention has been completed.
- It is a first object of the present invention to provide a connector set for medical use, in which the possibility of deterioration of the performance of the plug to seal the connecting port is significantly low even when insertion of the infusion needle into the plug is repeated, and the possibility of entering of "ground chips" or fine strips of the plug into the patient's body is significantly low, and to provide an indwelling catheter set using such connector set.
- It is a second object of the present invention to provide a connector set for medical use, in which the risk that the user pricks his/her finger or hand accidentally by the infusion needle is extremely low and hence it is not necessary to provide a protective wall surrounding the infusion needle so that the male luer taper may be downsized, and an indwelling catheter set using such connector set.
- The above-mentioned objects and other objects of the present invention will be clarified further more in the following description, and these objects are attained by the present invention comprising the constitution mentioned below.
- According to the present invention, a connector set for medical use as defined by
independent claim 1 and an indwelling catheter set using such connector set as defined byclaim 7 are provided. The dependent claims define preferred and advantageous embodiments of the invention. - The present invention relates to a connector set for medical use comprising:
- (a) a cannula housing; and
- (b) an infusion hub to be detachably connected to the cannula housing from its proximal end,
- (a) a catheter hub, a proximal portion of which is formed into a connecting port for feeding liquid; and
- (b) a plug formed of resilient material for sealing the connecting port, the plug being inserted into the connecting port,
- (a) an infusion needle for feeding liquid disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends, the infusion needle being detachably inserted into the plug from its proximal end when connecting the infusion hub and the cannula housing; and
- (b) an infusion tubing hub provided at a proximal portion of the infusion needle, the infusion tubing hub being detachably connected to the catheter hub from its proximal end when connecting the infusion hub and the cannula housing,
- The connector set for medical use may further comprise:
- an insertion hub to be detachably connected to the cannula housing from its proximal end,
- the insertion hub comprising:
- (a) an insertion needle disposed substantially in the axial direction, the insertion needle being detachably inserted into the plug from its proximal end when connecting the insertion hub and the cannula housing; and
- (b) an insertion needle hub provided at a proximal portion of the insertion needle, the insertion needle hub being detachably connected to the catheter hub from its proximal end when connecting the insertion hub and the cannula housing.
- The connecter set for medical use may further comprise:
- a guide formed into a hollow body opened at its distal and proximal ends for preventing dropping off of the plug from the connecting port,
- the guide being inserted into a portion of the connecting port, which is disposed proximally of the plug,
- the guide allowing detachable insertion of the infusion needle from its proximal end,
- the guide being formed with a tapered bore having a distally tapered shape at least at a proximal portion in the interior of the guide,
- an inner surface of the tapered bore being configured to guide the infusion needle toward a substantially axial center of the connecting port.
- The guide may comprise in the interior:
- (a) a straight bore forming a distal portion of the interior of the guide and having an inner diameter substantially constant in the axial direction; and
- (b) the tapered bore forming the proximal portion of the interior of the guide.
- The infusion needle and the infusion tubing hub may be integrally formed of plastic material,
the opening edge of the distal end of the infusion needle being formed to be orthogonal to the axial center of the infusion needle and the inner peripheral side and the outer peripheral side of the opening edge being respectively formed into the outwardly projecting curved surface at the time of molding. - The infusion needle may be coated with lubricant applied thereon.
- The present invention also relates to an indwelling catheter set comprising the above-described connector set,
wherein a through bore is formed in the catheter hub of the cannula housing substantially in the axial direction,
a proximal portion of the through bore being formed into the connecting port,
a catheter being inserted into a distal portion of the through bore,
the catheter being disposed substantially in the axial direction, and being formed into a hollow body opened at its distal and proximal ends,
the catheter being communicated with the infusion needle when the infusion needle is inserted into the plug. - The indwelling catheter set may comprise:
- (a) a cannula housing; and
- (b) an insertion hub and an infusion hub to be detachably connected to the cannula housing from its proximal end respectively,
- (a) a catheter disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends;
- (b) a catheter hub comprising a through bore formed substantially in the axial direction, the through bore comprising a distal portion for allowing insertion of the catheter and a proximal portion serving as a connecting port for feeding liquid; and
- (c) a plug formed of resilient material for sealing the connecting port by being inserted into the connecting port,
- (a) an insertion needle disposed substantially in the axial direction, the insertion needle being detachably inserted into the plug and the catheter from proximal ends thereof when connecting the insertion hub and the cannula housing; and
- (b) an insertion needle hub provided at a proximal portion of the insertion needle, the insertion needle hub being detachably connected to the catheter hub from its proximal end when connecting the insertion hub and the cannula housing,
- (a) an infusion needle for feeding liquid disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends, the infusion needle being detachably inserted into the plug from its proximal end, when connecting the infusion hub and the cannula housing, so as to communicate with the catheter; and
- (b) an infusion tubing hub provided at a proximal portion of the infusion needle, the infusion tubing hub being detachably connected to the catheter hub from its proximal end when connecting the infusion hub and the cannula housing,
-
- Fig. 1 to Fig. 16 show a first embodiment of the present invention, and Fig. 1 is a plan view.
- Fig. 2 is a plan view, partly in cross section, of Fig. 1.
- Fig. 3 is a vertical cross section of Fig. 2.
- Fig. 4 is a partly enlarged view of Fig. 3.
- Fig. 5 is an exploded view of Fig. 3.
- Fig. 6 is a plan view, partly in cross section, of a cannula housing in Fig. 2.
- Fig. 7 is a partly enlarged view of the cannula housing in Fig. 5.
- Fig. 8A is a side view of a guide in Fig. 7, Fig. 8B is a vertical cross section of Fig 8A.
- Fig. 9 is a plan view, partly in cross section, of an insertion hub in Fig. 2.
- Fig. 10 is a plan view showing a state in which the insertion hub in Fig. 1 is replaced by an infusion hub.
- Fig. 11 is a plan view, partly in cross section, of Fig. 10.
- Fig. 12 is a vertical cross section of Fig. 11.
- Fig. 13 is a plan view, partly in cross section, of a infusion hub in Fig. 11.
- Fig. 14 is a vertical cross section of Fig. 13.
- Fig. 15 is an enlarged view of a distal end of an infusion needle in Fig. 14.
- Fig. 16 is a vertical cross section showing the operation of the infusion needle in Fig. 15.
- Fig. 17 and Fig. 18 show a second embodiment of the present invention, and Fig. 17 is a vertical cross section.
- Fig. 18A is a side view of a guide in Fig. 17, Fig. 18B is a vertical cross section of Fig 18A.
- Fig. 19 and Fig. 20 show a third embodiment of the present invention, and Fig. 19 is a plan view, partly in cross section.
- Fig. 20 is a vertical cross section of Fig. 19.
- Fig. 21 and Fig. 22 show an example in the related art and Fig. 21 is a vertical cross section of the infusion needle.
- Fig. 22 is a vertical cross section showing the operation of the infusion needle in Fig. 21.
- Referring now to Fig. 1 to Fig. 16, the first embodiment in which the present invention is applied to an insulin administration set will be described. As shown in Fig. 1 to Fig. 5, and Fig. 10 to Fig. 12, the administration set includes a
cannula housing 1, aninsertion hub 2, and aninfusion hub 3. - As shown also in Fig. 6 and Fig. 7, the
cannula housing 1 includes a catheter (soft cannula, outer needle, shielding needle, catheter tube) 5, catheter hub (indwelling needle base, outer needle base, shielding needle base) 6, a fixing device (a caulking pin for fixation) 7, aplug 8, a guide (a caulking pin for guiding) 9. - The
catheter 5 is disposed (substantially) in the axial direction, and formed into an elongated transparent (translucent) hollow (tubular) body having openings at its distal and proximal ends. Thecatheter 5 has flexibility and is formed integrally of plastic material (resin material). The plastic material includes, for example, thermoplastic resin. The thermoplastic resin used here is, preferably, polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane (PU), tetrafluoroethylene-perfluoroalkyl-vinyl-ether copolymer (PFA), polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, polyoxymethylene, and more preferably, PTFE, ETFE, PP, and PU. - The
catheter hub 6 includes an upwardly projecting central protrusion (projection) 11 at the lateral center of the distal portion, upwardly projecting side protrusions (projections) 12 on the left and the right sides of the proximal portion, and adepression 13 depressed downward at the remaining portion. At the lateral center of thecentral protrusion 11, a through bore (insertion bore) 14 is formed so as to penetrate (substantially) in the axial direction. The throughbore 14 includes a proximally tapered distal tapered bore 15, astraight bore 16 having a constant inner diameter in the direction of the axial center, a proximally tapered bore 17 tapered toward the distal end, and a connectingport 19 for feeding liquid having a larger diameter than thestraight bore 16, all communicated with each other arranged in above-described sequence toward the proximal end. The proximal portion of thecatheter 5 is inserted and fixed in thestraight bore 16. The connectingport 19 may have a constant inner diameter in the direction of the axial center, or tapered toward the distal end at a small taper ratio depending on the cases. The inward side surfaces of theside protrusions 12 serve as guidingsurfaces 20, and the axially central portions of the guiding surfaces 20 are beveledsurfaces 21 extending inwardly as it proceeds to the distal end. Thecatheter hub 6 is integrally formed of plastic material (resin material), and the plastic material is preferably the same as those of thecatheter 5, polyethersulfone (PES), or ABS resin, and more preferably, PP, PE, PES, PVC, and ABS resin. - The fixing
device 7 clamps and fixes the proximal portion of thecatheter 5 in cooperation with the inner surface of the straight bore 16 of the throughbore 14, and is a hollow body having openings on the axial ends thereof. The portion other than the proximal end portion is a straight portion having a small outer diameter constant in the direction of axial center, and the proximal end portion is flared so as to be enlarged toward the proximal end. Fixation of thecatheter 5 with respect to thecatheter hub 6 is achieved in the following manner. In a first step, theheated fixing device 7 is press-fitted into the proximal portion of thecatheter 5. At this time, the proximal portion of thecatheter 5 is enlarged radially outwardly. Then, thecatheter 5 and the fixingdevice 7 are inserted into the throughbore 14 of thecatheter hub 6 from its proximal end, and the proximal portion of thecatheter 5 is clamped and fixed between the small diameter straight portion of the fixingdevice 7 and the inner surface of the straight bore 16 of the throughbore 14. The fixingdevice 7 is integrally formed, for example, of stainless steel (SUS304 is preferable), nickel-titan alloy, plastic material (resin material). - The
plug 8 is formed into substantially a columnar shape, and fitted and fixed into the connectingport 19 of thecatheter hub 6 for sealing the connectingport 19. As an example of the above-described "fitted", the present invention employs "press-fitting", and hence theplug 8 is press-fitted into the connectingport 19. The term "press-fitting" means a state of "inserted in a state of being compressed in the axial and radial directions", and the reason to press-fit is for desirably sealing the connectingport 19 by bringing the outer surface of theplug 8 into press-contact (close contact) with the inner surface of the connectingport 19. However, even when theplug 8 is not press-fitted into the connectingport 19, as will be described later, the connectingport 19 is satisfactorily sealed by press-contact (close contact) of theplug 8 with the inner surface of the connectingport 19 by fitting (press-fitting and fixing) theguide 9 into aproximal bore 24 of theplug 8 and the connectingport 19 of thecatheter hub 6. Adistal bore 23 of truncated conical shape is punctuated from the center of the distal end surface of theplug 8 toward the proximal end, and the proximal bore (engaging bore) 24 is punctuated (formed) from the center of the proximal surface of theplug 8 toward the distal end. The proximal bore 24 includes astraight bore 25 formed on the distal side having a constant inner diameter in the direction of the axial center, and atapered bore 26 is formed on the proximal side so as to be tapered toward the distal end. Theplug 8 is formed of a resilient material, for example, rubber material such as isoprene rubber, silicon rubber, butyl rubber, thermoplastic elastomer, silicon elastomer, or latex. - The
guide 9 has both a function for retaining (fixing) theplug 8, and a function for guiding an insertion needle of aninsertion hub 2 or an infusion needle of aninfusion hub 3 described later, and is fitted (press-fitted and fixed) into the proximal bore 24 of theplug 8 and the connectingport 19 of thecatheter hub 6. As shown also in Fig. 8, theguide 9 is formed into a hollow body having openings at its distal and proximal ends, and is integrally formed with acylindrical portion 28 to be inserted (press-fitted) into the straight bore 25 of theproximal bore 24, the tapered bore 26 of theproximal bore 24, and a taperedportion 29 to be press-fitted into the proximal end of the connectingport 19. Theguide 9 is fixed to thecatheter hub 6 and hence theplug 8 is fixed to thecatheter hub 6 by the proximal edge of the taperedportion 29 being press-fitted and fitted into the inner surface of theplug 8 while resiliently deforming the proximal end of the connectingport 19. Therefore, theplug 8 is prevented from falling off the connectingport 19. The interior of thecylindrical portion 28 is astraight bore 30 having a constant inner diameter in the direction of the axial center, and the interior of the taperedportion 29 is a distally tapered bore 31. The axial centers of thestraight bore 30 and the tapered bore 31 (substantially) align with the axial center of the connectingport 19 of thecannula housing 1. The inner surface of the tapered bore 31 guides the insertion needle and the infusion needle to the (substantially) axial center of theplug 8 when they are inserted into theplug 8, which will be described below. The inner diameter of the distal end of the tapered bore 31, that is, the smallest inner diameter, and the inner diameter of thestraight bore 30 are slightly larger than, but close to, the outer diameters of the insertion needle and the infusion needle as described later. Theguide 9 is integrally formed of the same material as the fixingdevice 7. - The
insertion hub 2 is to be detachably connected to thecannula housing 1 from its proximal end and, as shown in Fig. 9, includes an insertion needle (inner needle) 33, and an insertion needle hub (inner needle base) 34. - The
insertion needle 33 is detachably inserted into theguide 9, theplug 8, the fixingdevice 7, and thecatheter 5 of thecannula housing 1 and projects distally from thecatheter 5. Theinsertion needle 33 is disposed (substantially) in the axial direction, and is formed into a flexible elongated hollow (tubular) body having openings at its distal and proximal ends. The distal end of theinsertion needle 33 is cut obliquely with respect to the axial center thereof (bevel cut) and hence adistal opening edge 36 is beveled to provide a sharp cutting edge. The distal opening of theinsertion needle 33 faces upward. Theinsertion needle 33 is integrally formed, for example, of stainless steel (SUS 304 is preferable), or nickel-titan alloy. - The
insertion needle hub 34 is provided at the proximal portion of theinsertion needle 33, and is to be detachably connected to thecatheter hub 6 of thecannula housing 1 from its proximal end, and includes integrally formed amain body 38 and a pair of left and right engagingclaws 39. Theinsertion needle hub 34 is formed of the same material as thecatheter hub 6. - An insertion bore 41 for the insertion needle is formed at the lateral center of the
main body 38 so as to penetrate (substantially) in the axial direction. The insertion bore 41 includes a proximally tapered bore 42, astraight bore 43 having a constant inner diameter in the direction of axial center, adepressed portion 44 having an inner diameter constant in the direction of the axial center and larger than the outer diameter of thestraight bore 43, all communicated with each other arranged in above-described sequence toward the distal end. Theinsertion needle 33 is inserted from its distal end into the insertion bore 41, and fixed to the inner surface of the tapered bore 42 and thestraight bore 43 with anadhesive agent 45, so as to project distally from theinsertion needle hub 34 to a large extent. By forming the tapered bore 42 in the insertion bore 41, theinsertion needle 33 can be inserted easily into the insertion bore 41. There is a case that theinsertion needle 33 is welded to theinsertion needle hub 34. When connecting theinsertion hub 2 to thecannula housing 1, themain body 38 is inserted from the proximal end of thedepression 13 of thecatheter hub 6, that is, behind thecentral protrusion 11 and between theside protrusions 12, so that the distal surface abuts against the proximal surface of thecentral protrusion 11. - The engaging
claws 39 each constitute a locking mechanism for theinsertion hub 2 in cooperation with theside protrusions 12 of thecatheter hub 6, and project distally from the left and the right sides of the distal portion of themain body 38 so as to be capable of swinging in the lateral direction by resilient deformation of their own. The outward side surfaces of the distal portions of the engagingclaws 39 are beveledsurfaces 47 inclining inwardly as they proceed toward the distal end, and the proximal sides of thebeveled surfaces 47 on the above-described outward side surfaces are formed withdepressions 48 which are depressed inwardly, and the distal inner surfaces of thedepressions 48 serve as engagingportions 49 having proximally facing planar surfaces, respectively. When connecting theinsertion hub 2 into thecannula housing 1, the engagingclaws 39, being guided by the guidingsurface 20 of thecatheter hub 6 and resiliently deformed inwardly, are inserted between thecentral protrusion 11 and theside protrusions 12 of thecatheter hub 6. When the bevel surfaces 47 are moved distally of theside protrusions 12 of thecatheter hub 6, they swing outwardly by their resilient recovery force, and the engagingportions 49 move distally of theside protrusions 12, so that an accidental disconnection of theinsertion hub 2 from thecannula housing 1 is prevented. Disconnection of theinsertion hub 2 from thecannula housing 1 can easily be done by holding both engagingclaws 39 and swinging inwardly, moving the engagingportions 49 inwardly of theside protrusions 12 and moving theinsertion hub 2 proximally of thecannula housing 1. - The
infusion hub 3, which is to be detachably connected to thecannula housing 1 from its proximal end and, as shown in Fig. 13 and Fig. 14 as well, includes an infusion needle (solution infusion needle) 51 for feeding liquid, an infusion tubing hub (infusion needle base, solution infusion needle base) 52, a tube (liquid feeding line) 53, and aconnector 54. - The
infusion needle 51 is to be connected to the liquid feeding line and detachably inserted into theguide 9 and theplug 8 of thecannula housing 1 so as to communicate with thecatheter 5. Theinfusion needle 51 is disposed (substantially) in the axial direction and formed into a flexible elongated hollow (tubular) body having openings at its distal and proximal ends, and has (substantially) the same outer diameter as theinsertion needle 33. As shown in Fig. 15, a surface of an (entire) openingedge 56 of the distal end of theinfusion needle 51 is orthogonal to anaxial center 57 of theinfusion needle 51. The opening edge 56 (The surface of the opening edge 56) of theinfusion needle 51 is smoothly chamfered, and at least (the surface (outer surface) of) the outer peripheral side (periphery) and the inner peripheral side of the openingedge 56 is formed into an outwardly projecting (swelling) curved surface (curved projection) so as to make the openingedge 56 into a nonsharp state. Therefore, theinfusion needle 51 has little or no puncturing capability. More specifically, in the present example, (the surface (outer surface) of) the openingedge 56 has a flat surface (plane face) 58 having a distally facing planar surface at the radially center thereof, an inwardly projecting (swelling) curved surface (curved face, curved projection) 59 curvedly projecting (swelling) distally and radially inwardly at the inner peripheral side (periphery) thereof, and an outwardly projecting (swelling) curved surface (curved face, curved projection) 60 curvedly projecting (swelling) distally and radially outwardly at the outer peripheral side (periphery) thereof. It is also possible to form theentire opening edge 56 into an outwardly (distally) projecting (swelling) curved surface (curved projection) without providing a flat surface. Theinfusion needle 51 is integrally formed, for example, of stainless steel (SUS 304 is preferable). Theinfusion needle 51 is coated with lubricant such as silicone oil or the like applied thereon. - An
infusion tubing hub 52, being provided at the proximal portion of theinfusion needle 51, is to be detachably connected to thecatheter hub 6 of thecannula housing 1 from its proximal end, and includes amain body 61 and a pair of left and right engagingclaws 62 integrally formed with each other, similar to theinsertion needle hub 34. Theinfusion tubing hub 52 is formed of the same material as thecatheter hub 6 or theinsertion needle hub 34. - An infusion needle insertion bore 64 is formed (substantially) in the axial direction so as to penetrate through the lateral center of the
main body 61. The insertion bore 64 includes a proximally tapered bore 65, astraight bore 66 having a constant inner diameter in the direction of the axial center, a tube fitting bore 67 having an inner diameter constant in the direction of the axial center and larger than that of thestraight bore 66, all communicated with each other arranged in the above-described sequence toward the proximal end. Theinfusion needle 51 is inserted into the insertion bore 64 from its distal end, and fixed to the inner surfaces of the tapered bore 65 and thestraight bore 66 with anadhesive agent 68 so as to project distally from themain body 61. By forming the tapered bore 65 in the insertion bore 64, theinfusion needle 51 can easily be inserted into the insertion bore 64. There is also a case in which theinfusion needle 51 is welded to theinfusion tubing hub 52. When connecting theinfusion hub 3 to thecannula housing 1, themain body 61 is inserted into the proximal portion of thedepression 13 of thecatheter hub 6, that is, behind thecentral protrusion 11 and between theside protrusions 12 from its proximal end, so that the distal surface abuts against the proximal surface of thecentral protrusion 11. - The engaging
claws 62 each constitute a locking mechanism for theinsertion hub 3 in cooperation with theside protrusions 12 of thecatheter hub 6, and project distally from the left and the right sides of the distal portion of themain body 61 so as to be capable of swinging in the lateral direction by resilient deformation of their own. The outward side surfaces of the distal portions of the engagingclaws 62 are beveledsurfaces 70 inclining inwardly as they proceed toward the distal end, and the proximal sides of thebeveled surfaces 70 on the above-described outward side surface are formed withdepressions 71 which are depressed inwardly, and the distal inner surfaces of thedepressions 71 serve as engagingportions 72 having proximally facing planar surfaces, respectively. When connecting theinfusion hub 3 to thecannula housing 1, the engagingclaws 62, being guided by the guidingsurface 20 of thecatheter hub 6 and resiliently deformed inwardly, are inserted between thecentral protrusion 11 and theside protrusions 12 of thecatheter hub 6. When thebeveled surfaces 70 are moved distally of theside protrusions 12 of thecatheter hub 6, they swing outwardly by their resilient recovery force, and the engagingportions 72 move distally of theside protrusions 12, so that an accidental disconnection of theinfusion hub 3 from thecannula housing 1 is prevented. Disconnection of theinfusion hub 3 from thecannula housing 1 can easily be done by holding both engagingclaws 62 and swinging inwardly, moving the engagingportions 72 inwardly of theside protrusions 12 and moving theinfusion hub 3 proximally of thecannula housing 1. - The
tube 53 is an example of the liquid feeding line, and is transparent (translucent). The distal end of thetube 53 is fitted on the proximal portion of theinfusion needle 51, and is fixed to the inner surface of the tube fitting bore 67 of the insertion bore 64 of theinfusion tubing hub 52, for example, with adhesion or welding. The length of thetube 53 may be freely determined as needed depending on the location of the insulin administration pump (not shown). Thetube 53 is integrally formed of plastic material. - The
connector 54 is a hollow body having openings at its distal and proximal ends, and fitted onto the proximal end of thetube 53 in communication with each other, and is to be connected to an insulin administration pump directly or indirectly via a connecting line (member) such as a tube. The opening of the proximal end of theconnector 54 is sealed by a sealingmember 74 such as a filter or a lid member before connecting the connecting line to theconnector 54. Theconnector 54 is integrally formed of the same material as thecatheter hub 6. - In the first embodiment described above, insertion of the
catheter 5 under the skin of a patient is carried out by connecting theinsertion hub 2 to thecannula housing 1, connecting theinsertion needle hub 34 of theinsertion hub 2 to thecatheter hub 6 of thecannula housing 1 from its proximal end, and inserting theinsertion needle 33 of theinsertion hub 2 to theguide 9, theplug 8, the fixingdevice 7, and thecatheter 5 of thecannula housing 1 from its proximal end as shown in Fig. 1 to Fig. 3, and when inserting theinsertion needle 33 into theplug 8, theplug 8 is resiliently deformed. - The axial centers of the
straight bore 25 and the tapered bore 26 of theguide 9 are (substantially) aligned with the axial center of the connectingport 19 of thecannula housing 1, and the inner diameter of the distal end of the tapered bore 26, that is, the smallest inner diameter, and the inner diameter of thestraight bore 25 are slightly larger than the outer diameter of theinsertion needle 33. Therefore, when inserting theinsertion needle 33 as described above, the sharp edged distal end of theinsertion needle 33 is guided by the inner surface of the tapered bore 26 of theguide 9 while being centered, and is guided into the (substantially) axial center of theguide 9, that is, of the connectingport 19 so as to be inserted easily into the straight bore 25 of theguide 9. Accordingly, theinsertion needle 33 can easily be inserted into the (substantially) axial center of theplug 8, and theinsertion needle 33 is projected distally from thedistal bore 23 of theplug 8, so as to be inserted into thecatheter 5 of via thefixing device 7. - In this manner, in a state in which the
insertion hub 2 is connected to thecannula housing 1, theinsertion needle 33 and thecatheter 5 are inserted under the skin of the patient. Then, theinsertion hub 2 is disconnected from thecannula housing 1 to pull out theinsertion needle 33 from under the skin of the patient and from thecannula housing 1, and thecatheter 5 is indwelled under the skin of the patient. In this case, the trace (puncture) formed by theinsertion needle 33 on theplug 8 is sealed by resilient recovering force of theplug 8. Therefore, the risk of leakage of blood from the connectingport 19 of thecannula housing 1 or entrance of outside air from the connectingport 19 into the throughbore 14 may be eliminated. - Subsequently, discontinuous or continuous administration of insulin is carried out, as shown in Fig. 10 to Fig. 12, by connecting the
infusion hub 3, to which the insulin administration pump is connected, to thecannula housing 1, connecting theinfusion tubing hub 52 of theinfusion hub 3 to thecatheter hub 6 of thecannula housing 1 from its proximal end, and then inserting theinfusion needle 51 of theinfusion hub 3 to theguide 9 and theplug 8 of thecannula housing 1 from its proximal end so as to communicate with thecatheter 5. Thedistal opening edge 56 has aflat surface 58 having a distally facing planar surface at the radially center thereof, an inwardly projecting (swelling)curved surface 59 curvedly projecting distally and radially inwardly at (the surface of) the inner peripheral side (periphery) thereof, and an outwardly projecting (swelling)curved surface 60 curvedly projecting (swelling) distally and radially outwardly at (the surface of) the outer peripheral side (periphery) thereof. Therefore, theinfusion needle 51 itself has little or no puncturing capability. - However, since the trace of the
insertion needle 33, which is pulled out, exists in the closed state at the (substantially) axial center of theplug 8, theinfusion needle 51 is inserted into thetrace 76 of theplug 8 so as to follow thetrace 76 while resiliently deforming theplug 8 as shown in Fig. 16. - In this manner, when the
infusion needle 51 is inserted into theplug 8, theinfusion needle 51 neither tears theplug 8 while advancing, nor cuts off theplug 8 by the inner peripheral side (periphery) of the openingedge 56 of theinfusion needle 51 as in the related art, but theinfusion needle 51 is inserted into thetrace 76 of theinsertion needle 33. - Therefore, even when insertion of the
infusion needle 51 into theplug 8 is repeated for administrating insulin depending on the condition of the patient, the possibility of occurrence of a phenomenon that a bore is formed in the plug 8 (coring) because theplug 8 is ground off is extremely low. Therefore, the risk of deterioration of the sealing performance of the connectingport 19 by theplug 8 is extremely low, and the risk of entering of the "ground chips" of theplug 8 into theinfusion needle 51 or thecatheter 5, and eventually into the patient's body is extremely low. - In addition, as described above, the
infusion needle 51 itself has little or no capability of puncturing theplug 8, and theinfusion needle 51 is inserted into thetrace 76 of theinsertion needle 33. Therefore, the risk that theinfusion needle 51 is inserted into theplug 8 at different positions at every insertion into theplug 8 and hence tears theplug 8 is extremely low. Therefore, even when insertion of theinfusion needle 51 into theplug 8 is repeated, the risk that theplug 8 loses its original strength or the recovering performance is extremely low, and hence the risk that the sealing performance of theplug 8 with respect to the connectingport 19 is deteriorated is extremely low and the risk that theplug 8 is repeatedly torn is also extremely low as described above. Consequently, the risk of generating fine strips of theplug 8 is extremely low, and the risk that the fine strips of theplug 8 enter into the patient's body is also extremely low. - When the
guide 9 is not provided on thecannula housing 1, the position of theplug 8 where theinsertion needle 33 is to be inserted does not align with the (substantially) axial center of theplug 8, but is dispersed in a wide area including the axial center of theplug 8, and theinfusion needle 51 can hardly follow thetrace 76 of theinsertion needle 33 in theplug 8. - However, according to the present embodiment, the
guide 9 is provided on thecannula housing 1, the axial centers of thestraight bore 30 and the tapered bore 31 of the guide 9 (substantially) align with the axial center of the connectingport 19 of thecannula housing 1, and the inner diameter at the distal end of the tapered bore 31, that is, the smallest inner diameter thereof, and the inner diameter of thestraight bore 30 are slightly larger than the outer diameter of theinsertion needle 33. Therefore, as described above, theinsertion needle 33 is inserted into the (substantially) axial center of theplug 8. When theinfusion needle 51 is inserted into theplug 8 as well, theinfusion needle 51 is guided by the inner surface of the tapered bore 31 of theguide 9 while being centered, and is guided into the (substantially) axial center of theguide 9, that is, of the connectingport 19 so as to be easily inserted into the straight bore 30 of theguide 9. In addition, theinfusion needle 51 has (substantially) the same outer diameter as theinsertion needle 33, and the outer diameter thereof is slightly smaller than the inner diameter of thestraight bore 30. Therefore, theinfusion needle 51 can easily be inserted into thetrace 76 in theplug 8 smoothly by following (tracing) thetrace 76 of theinsertion needle 33, and insertion and pulling out of theinfusion needle 51 into/from thetrace 76 can easily be repeated. - In addition, as described above, since the
infusion needle 51 itself has little or no puncturing capability, the risk that the user picks his/her finger or hand is extremely low. Therefore, it is not necessary to provide a protective wall for surrounding theinfusion needle 51 as shown inUSP No.6056718 , and hence theinfusion hub 3 can be downsized. In addition, since theinfusion needle 51 is coated with lubricant applied thereon, theinfusion needle 51 can be inserted into thetrace 76 in theplug 8 easily and smoothly. - By driving the insulin administration pump after the
infusion needle 51 of theinfusion hub 3 is inserted into theplug 8 of thecannula housing 1 as described above, the insulin can be administered into the patient's body discontinuously or continuously via theconnector 54, thetube 53, theinfusion needle 51, the fixingdevice 7, and thecatheter 5 of theinfusion hub 3 from the pump. - When the administration is completed, the
infusion hub 3 is disconnected from thecannula housing 1 to disconnect theinfusion tubing hub 52 of theinfusion hub 3 from thecatheter hub 6 of thecannula housing 1, and then theinfusion needle 51 of theinfusion hub 3 is pulled out from theplug 8 and theguide 9 of thecannula housing 1. In this case, the trace of the infusion needle 51 (that is, thetrace 76 of the insertion needle 33) of theplug 8 is closed by the resilient recovering force of theplug 8, and the risk of leakage of blood from the connectingport 19 of thecannula housing 1 or entrance of outside air from the connectingport 19 into the throughbore 14 is eliminated. - Fig. 17 and Fig. 18 show a second embodiment of the present invention, in which the
guide 9 has a configuration as in the first embodiment but having thecylindrical portion 28 removed from theguide 9 and being tapered toward the distal end. - Fig. 19 and Fig. 20 show a third embodiment of the present invention, and the
infusion needle 51 and theinfusion tubing hub 52 of theinfusion hub 3 are integrally molded of plastic material. At the time of molding, the openingedge 56 of the distal end of theinfusion needle 51 is molded as in the same manner as the first embodiment. - In the first embodiment, it is necessary to carry out machining to the opening
edge 56 of the distal end of theinfusion needle 51, and hence the number of machining steps increases correspondingly in comparison with the related art, and hence increase in manufacturing cost may result. Also, in the first embodiment, the step of adhering or welding theinfusion needle 51 to theinfusion hub 52 is also necessary as in the related art. - However, according to the third embodiment, the
infusion needle 51 and theinfusion tubing hub 52 are integrally molded, and at the time of molding, the openingedge 56 of the distal end of theinfusion needle 51 is molded as in the first embodiment. Therefore, it is not necessary to carry out machining to the openingedge 56 of the distal end of theinfusion needle 51, and hence the number of machining steps does not increase in comparison with the related art. In addition, the process of adhering or welding theinfusion needle 51 to theinfusion tubing hub 52, which has been necessary in the related art as well, is not necessary. Therefore, according to the third embodiment, the cost of manufacturing theinfusion hub 3, that is, the insulin administration set may be reduced with respect to the related art. - In the embodiments described above, the present invention is applied to an insulin administration set. However, the present invention is applicable to (1) various indwelling catheter sets for solution infusion other than insulin, blood transfusion, blood collection, dialysis therapy, and so on, and (2) various connectors for medical use in which the cannula housing does not have a catheter, and is provided on a solution infusion line, a blood transfusion line, a blood collection line, and an arterial and venous line for dialysis therapy.
an inner peripheral side and an outer peripheral side of the opening edge being respectively formed into an outwardly projecting curved surface.
Claims (7)
- A connector set for medical use comprising:(a) a cannula housing (1); and(b) an infusion hub (3) to be detachably connected to the cannula housing (1) from its proximal end,the cannula housing (1) comprising:(a) a catheter hub (6), a proximal portion of which is formed into a connecting port (19) for feeding liquid; and(b) a plug (8) formed of resilient material for sealing the connecting port (19), the plug (8) being inserted into the connecting port (19),the infusion hub (3) comprising:(a) an infusion needle (51) for feeding liquid disposed substantially in the axial direction and formed into a hollow body opened at its distal and proximal ends, the infusion needle (51) being detachably inserted into the plug (8) from its proximal end when connecting the infusion hub (3) and the cannula housing (1); and(b) an infusion tubing hub (52) provided at a proximal portion the infusion needle (51), the infusion tubing hub (52) being detachably connected to the catheter hub (6) from its proximal end when connecting the infusion hub (3) and the cannula housing (1),characterized in that
an opening edge (56) of distal end of the infusion needle (51) is orthogonal to an axial center (57) of the infusion needle (51),
an inner peripheral side and an outer peripheral side of the opening edge (56) being formed into outwardly projecting curved surfaces (59, 60). - A connector set for medical use according to claim 1, further comprising:an insertion hub (2) to be detachably connected to the cannula housing (1) from its proximal end,the insertion hub (2) comprising:(a) an insertion needle (33) disposed substantially in the axial direction, the insertion needle (33) being detachably inserted into the plug (8) from its proximal end when connecting the insertion hub (2) and the cannula housing (1); and(b) an insertion needle hub (34) provided at a proximal portion of the insertion needle (33), the insertion needle hub (34) being detachably connected to the catheter hub (6) from its proximal end when connecting the insertion hub (2) and the cannula housing (1).
- A connector set for medical use according to claim 1 or 2, further comprising:a guide (9) formed into a hollow body opened at its distal and proximal ends for preventing dropping off of the plug (8) from the connecting port (19),the guide (9) being inserted into a portion of the connecting port (19), which is disposed proximally of the plug (8),the guide (9) allowing detachable insertion of the infusion needle (51) from its proximal end,the guide (9) being formed with a tapered bore (31) having a distally tapered shape at least at a proximal portion in the interior of the guide (9),an inner surface of the tapered bore (31) being configured to guide the infusion needle (51) toward a substantially axial center of the connecting port (19).
- A connector set for medical use according to claim 3, wherein the guide (9) comprises in the interior:(a) a straight bore (30) forming a distal portion of the interior of the guide (9) and having an inner diameter substantially constant in the axial direction; and(b) the tapered bore (31) forming the proximal portion of the interior of the guide (9).
- A connector set for medical use according to any one of claims 1-4, wherein the infusion needle (51) and the infusion tubing hub (52) are integrally formed of plastic material,
the opening edge (56) of the distal end of the infusion needle (51) being formed to be orthogonal to an axial center (57) of the infusion needle (51)and the inner peripheral side and the outer peripheral side of the opening edge (56) being formed into the outwardly projecting curved surfaces (59, 60) at the time of molding. - A connector set for medical use according to any one of claims 1-5, wherein the infusion needle (51) is coated with lubricant applied thereon.
- An indwelling catheter set comprising:the connector set according to any one of claims 1-6,wherein a through bore (14) is formed in the catheter hub (6) of the cannula housing (1) substantially in the axial direction,a proximal portion of the through bore (14) being formed into the connecting port,a catheter (5) being inserted into a distal portion of the through bore (14),the catheter (5) being disposed substantially in the axial direction, and being formed into a hollow body opened at its distal and proximal ends,the catheter (5) being communicated with the infusion needle (51) when the infusion needle (51) is inserted into the plug (8).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003103827 | 2003-04-08 | ||
JP2003103827A JP2004305466A (en) | 2003-04-08 | 2003-04-08 | Medical connector set and catheter set for dwelling using the same |
Publications (3)
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EP1466645A2 EP1466645A2 (en) | 2004-10-13 |
EP1466645A3 EP1466645A3 (en) | 2005-04-27 |
EP1466645B1 true EP1466645B1 (en) | 2007-08-22 |
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EP04008646A Expired - Lifetime EP1466645B1 (en) | 2003-04-08 | 2004-04-08 | Connector set for medical use and indwelling catheter set using such connector set |
Country Status (6)
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US (1) | US20040204690A1 (en) |
EP (1) | EP1466645B1 (en) |
JP (1) | JP2004305466A (en) |
AT (1) | ATE370763T1 (en) |
DE (1) | DE602004008363T2 (en) |
DK (1) | DK1466645T3 (en) |
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- 2003-04-08 JP JP2003103827A patent/JP2004305466A/en active Pending
-
2004
- 2004-04-07 US US10/819,128 patent/US20040204690A1/en not_active Abandoned
- 2004-04-08 DE DE602004008363T patent/DE602004008363T2/en not_active Expired - Fee Related
- 2004-04-08 DK DK04008646T patent/DK1466645T3/en active
- 2004-04-08 EP EP04008646A patent/EP1466645B1/en not_active Expired - Lifetime
- 2004-04-08 AT AT04008646T patent/ATE370763T1/en not_active IP Right Cessation
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US8777932B2 (en) | 2010-04-29 | 2014-07-15 | Medtronic, Inc. | Catheter connectors and systems, and methods of using same |
US8845615B2 (en) | 2010-04-29 | 2014-09-30 | Medtronic, Inc. | Clamping catheter connectors, systems, and methods |
US11357962B2 (en) | 2013-02-13 | 2022-06-14 | Becton, Dickinson And Company | Blood control IV catheter with stationary septum activator |
US9789279B2 (en) | 2014-04-23 | 2017-10-17 | Becton, Dickinson And Company | Antimicrobial obturator for use with vascular access devices |
US9956379B2 (en) | 2014-04-23 | 2018-05-01 | Becton, Dickinson And Company | Catheter tubing with extraluminal antimicrobial coating |
US10589063B2 (en) | 2014-04-23 | 2020-03-17 | Becton, Dickinson And Company | Antimicrobial obturator for use with vascular access devices |
US11219705B2 (en) | 2014-07-08 | 2022-01-11 | Becton, Dickinson And Company | Antimicrobial coating forming kink resistant feature on a vascular access device |
Also Published As
Publication number | Publication date |
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DE602004008363D1 (en) | 2007-10-04 |
DE602004008363T2 (en) | 2008-05-15 |
DK1466645T3 (en) | 2007-12-10 |
EP1466645A3 (en) | 2005-04-27 |
ATE370763T1 (en) | 2007-09-15 |
US20040204690A1 (en) | 2004-10-14 |
JP2004305466A (en) | 2004-11-04 |
EP1466645A2 (en) | 2004-10-13 |
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